Solve for xxx: ex=20e^{x} = 20ex=20 (use ln\lnln)
x=ln(20)x = \ln(20)x=ln(20)
x=log10(20)x = \log_{10}(20)x=log10(20)
x=20x = 20x=20
x=e20x = e^{20}x=e20